What if a wearable could help you understand how your brain responds to stress, exercise, sleep and everyday activities? That is the idea behind Temple, an experimental health-tracking device developed by a startup founded by Zomato co-founder Deepinder Goyal.
Unlike conventional smartwatches and fitness bands, Temple is designed to sit on the side of the head, near the temple region. It uses optical sensors to monitor physiological signals associated with blood flow to the brain.
The device has attracted attention because of its unusual design and focus on brain-related health monitoring. Temple opened pre-orders for its first batch on November 1, 2026, with shipments expected before the end of the year.
However, it is important to understand what the device actually measures and whether its readings can provide reliable insights into brain health.
What Is the Temple Wearable?
Temple is a wearable health-monitoring device developed by Deepinder Goyal’s startup, Temple.
The small device attaches to the side of the head using adhesive grips. Its placement allows the sensors to collect optical signals from the temple region.
The company aims to provide continuous information about physiological changes associated with cerebral blood flow, metabolic demand and cognitive activity.
Unlike traditional fitness trackers, which mainly focus on heart rate, steps, sleep and physical activity, Temple focuses on signals associated with brain-related physiology.
However, Temple is not a brain-computer interface. It does not directly read thoughts or record electrical brain activity like an EEG device.
How Does the Temple Wearable Work?
Temple uses a technology called Photoplethysmography (PPG). This is the same basic light-based sensing technology found in many smartwatches and fitness trackers.
PPG sensors shine light into the skin and measure changes in the reflected light. These changes help estimate variations in blood volume in the underlying tissue.
Temple uses this approach near the temple region to develop measurements associated with brain blood flow.
The company has introduced its own measurement systems, including BrainFlow and Entropy.
1. BrainFlow
BrainFlow is one of Temple’s main features.
It aims to track changes associated with blood circulation in the brain. Blood flow plays an important role in delivering oxygen and nutrients to brain tissue.
According to Goyal, the technology is designed to help users understand how activities such as exercise, sleep, meditation and prolonged sitting influence these physiological signals.
Temple has also shared results from validation studies comparing its readings with other measurement technologies. However, these findings still require further independent research and peer-reviewed evidence.
2. Entropy
Another interesting feature is Entropy.
Temple describes Entropy as a measurement of the body’s real-time metabolic and physiological demand. It appears as a live numerical score ranging from 1 to 250.
According to Goyal, the reading can change with different activities and conditions, including:
- Physical exercise
- Mental stress
- Sleep and recovery
- Caffeine consumption
- Meals
- Meditation
The idea is to help users understand how their bodies respond to everyday activities.
For example, users could observe how their readings change during exercise and recovery. However, Entropy should be understood as a company-developed metric rather than an established medical measurement.
3. Cognitive Load
Temple also aims to provide insights into cognitive load.
Cognitive load refers to the amount of mental effort required to complete a task or process information.
For instance, solving complex problems, concentrating for long periods or handling demanding work can increase mental effort.
Temple aims to help users observe physiological changes associated with these activities. Nevertheless, its readings should not be treated as a direct measurement of intelligence, concentration ability or neurological health.
Temple Wearable Design and Features
Temple has a compact design that attaches to the side of the head using adhesive grips. Its smaller form factor allows users to wear it alongside everyday accessories.
According to Goyal’s recent updates, the device has become less than half the size of its earlier design.
Here are some of the details shared about the wearable:
| Specifications | Details |
|---|---|
| Product type | Health-monitoring wearable |
| Placement | Side of the head |
| Sensor technology | Photoplethysmography (PPG) |
| Main measurement | BrainFlow |
| Additional measurement | Entropy |
| Entropy scale | 1–250 |
| Attachment | Adhesive Grips |
| Colours | Six launch colours |
| Connectivity | Details to be confirmed |
| Battery life | Not officially confirmed |
The launch edition comes in six colours:
- True Gold
- Rose Gold
- Black Mirror
- Real Jade
- Deep Blue
- Purple Funk
Real Jade, Deep Blue and Purple Funk are among the limited-edition colour options.
Temple Wearable Price and Availability
Temple opened pre-orders for its first production batch, called Temple Batch 01, on November 1, 2026.
The company plans to manufacture each device after receiving an order. Early-access users receive priority, while remaining orders follow a first-come, first-served system.
Regarding pricing, selected early-access invitations reportedly mentioned an Indian price of Rs. 85,000, including a lifetime subscription. However, this figure has not been formally confirmed as the final public retail price.
Goyal has also previously indicated a price of approximately US$1,000.
The first batch is expected to ship before the end of 2026, although delivery schedules may vary.
Availability in Nepal: Temple has not announced an official launch, retail price or distribution partner in Nepal. Therefore, its Nepal availability remains unconfirmed.
Can Temple Really Monitor Brain Health?
One of the biggest questions surrounding Temple is whether a wearable attached to the skin can accurately measure changes associated with blood flow inside the brain.
The device uses optical sensing technology, but measuring signals near the temple is not automatically the same as directly measuring blood flow throughout the brain.
Temple has shared validation results from studies comparing its readings with established measurement methods. However, independent researchers still need to examine these claims through further testing and peer-reviewed studies.
It is also important to distinguish between monitoring physiological signals and diagnosing medical conditions.
For example, a change in a BrainFlow reading does not automatically indicate a neurological disorder, stroke risk or reduced brain function.
Therefore, Temple should currently be viewed as an experimental wellness and research-focused wearable rather than a replacement for medical tests or professional neurological advice.
What Makes Temple Different From Smartwatches?
Most smartwatches focus on activity tracking and general health monitoring. They measure information such as heart rate, blood oxygen estimates, sleep patterns, steps and exercise performance.
Temple takes a different approach by focusing on physiological signals collected from the temple region.
| Feature | Traditional Smartwatch | Temple |
|---|---|---|
| Wearing position | Wrist | Side of the head |
| Sensor approach | Optical sensors and other sensors | Optical PPG |
| Heart rate | Common feature | Not its primary focus |
| Activity tracking | Common feature | Not its primary focus |
| Brain-related signals | Not a primary feature | Main focus |
| Special measurements | Sleep, steps, heart rate and more | BrainFlow and Entropy |
The two products target different aspects of health monitoring. Temple does not necessarily replace a smartwatch, but it introduces another approach to tracking physiological information.
Final Thoughts
Temple introduces an unusual idea to the wearable technology market. Instead of focusing mainly on steps, heart rate and calories, it aims to provide continuous insights into physiological signals associated with brain blood flow and mental or physical strain.
Its BrainFlow and Entropy measurements make it an interesting development in health-focused wearable technology.
However, the technology still needs broader independent validation before users can rely on its readings for meaningful medical conclusions.
For now, Temple is worth watching as an experimental wearable that could open new possibilities for personal health monitoring if its claims hold up under further research.
Frequently Asked Questions (FAQs)
Temple is a health-monitoring wearable developed by Deepinder Goyal’s startup. It attaches to the side of the head and tracks physiological signals associated with brain blood flow.
No. Temple does not currently read thoughts or directly record electrical brain activity. Its main focus is monitoring optical signals associated with blood flow and physiological demand.
BrainFlow is Temple’s proprietary measurement system designed to track changes associated with blood circulation in the brain.
Selected early-access invitations reportedly mentioned an Indian price of Rs. 85,000, including a lifetime subscription. However, the final public retail price has not been officially confirmed.
Pre-orders for Temple Batch 01 opened on November 1, 2026. The first devices are expected to ship before the end of 2026.
Temple has not announced an official Nepal launch or local pricing.